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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae289f148179ce04b4681885124eb7020e3c5299ce21efe3c0c2c7aac8705e75' 
  AND token = 'Z50YO9Y7CmErAl/KA9rg4g8y0yw8tn9N/rYfVPenK9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}